Renamed main.cc to HMollerPol.cc
Two pointless files added, I (= Val) will add content later.
Hello world
CMakeLists.txt that will require Geant4, ROOT, and that pulls in all the
src and include files.  It creates a shared library libHMollerPol.so
that can be loaded in ROOT to look at events in the output ROOT tree (in
the future).
Added stuff
Renamed HMollerPolConstruction to HMollerPolDetectorConstruction so Val
is happy with the descriptive names.
Probably better to give this an .hh extensions.
added in some comments on how gdml works and some little tricks that are
good to know
Added in gui stuff including the ablity to add in custom commands to the
gui in a drop down menu.  This will make us all :)
Added in some notes on using NIST variables with GDML.
I took out the NIST variables.  This file will only have to contain the
non-NIST variables.  The NIST variables will be defined in
the DetectorCostruction.cc and then can be used directly in the GDML
geometries files.
I added some more information on how GDML and materials work.
This file creates and fill in the drop down menu for the Geant4
interactive GUI.

One can add more to it at any time to make using the GUI a little easier
for everyone.  It is a great place to put in very commonly used commands
the .hh and .cc file for the solenoid magnetic field for the H target

Right now it is a constant 8 Tesla field in the Z direction.  There
are no fringe fields.

More to be added later to make it realistic.